Greetings. Waterproofing is very important, if there are no leaks and dampness, then the building will last as long as possible. Our enterprise last month was also engaged in the construction of buildings. Synthetic membranes from technonicol were used for roof waterproofing. There are a lot of choices, we chose the LOGICROOF V-SR. This PVC membrane is excellent for sealing joints between different roof elements.